A test tube cap screwing device

Abstract

The present invention provides a test tube cap screwing device, which includes a cap screwing device body. The cap screwing device body includes a plurality of clamping mechanism bodies for clamping the caps of test tubes, a driving component, a first guiding component, and a second guiding component. The first guiding component is connected to the second guiding component, and the clamping mechanism body is connected to the first guiding component. The driving component drives the first guiding component to rotate, drives the second guiding component to rotate and reciprocate along the axial direction of the cap, so as to drive the rotating first guiding component to reciprocate along the axial direction of the cap, making the clamping mechanism body clamping the cap rotate and reciprocate along the axial direction of the cap, and screwing the cap into or out of the tube body of the test tube. Through one driving component, the rotation of the clamping mechanism body and the reciprocating motion along the axial direction of the test tube can be realized simultaneously, with a simple structure, easy control of the cap screwing operation, and small occupied space.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a test tube cap screwing device. Background Art

[0002] In the medical field, after a sample to be tested is loaded into a test tube, it needs to be stored and analyzed. Currently, intelligent operation has replaced manual operation in medical examinations, and the development of automated medical examination equipment has been mature. After placing the test tube filled with the sample to be tested into the automated equipment, subsequent analytical operations such as liquid preparation, liquid separation, dilution, and detection are performed by the instrument. Therefore, it is necessary to frequently perform operations of removing and covering the caps of test tubes.

[0003] Currently, the existing test tube cap screwing usually requires multiple driving components (such as multiple motors) to separately operate two different actions of removing and covering the caps. The structure is complex, the control difficulty is relatively high, and it occupies a large space in the inspection equipment. Or, by simultaneously performing two movements of the driving component rotating and reciprocating along the axis direction of the test tube to separately operate the removal and covering of the caps, other moving components are also required to fix and assist the movement of the driving component, resulting in a complex structure and inconvenient operation. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, an object of the present invention is to provide a test tube cap screwing device. Through one driving component, the rotation of the clamping mechanism body and the reciprocating movement along the axis of the test tube can be simultaneously achieved, and then the operation of screwing the test tube cap can be performed. The structure is simple and easy to control.

[0005] In order to achieve the above object, the present invention is realized through the following technical solutions.

[0006] The present invention provides a test tube cap screwing device, including a cap screwing device body. The cap screwing device body includes a plurality of clamping mechanism bodies for clamping the caps of the test tubes, a driving component, a first guiding component, and a second guiding component. The first guiding component is connected to the second guiding component, and the clamping mechanism body is connected to the first guiding component. Among them,

[0007] The driving component drives the first guiding component to rotate, drives the second guiding component to rotate and reciprocate along the axis of the cap, so as to drive the rotating first guiding component to reciprocate along the axis of the cap, and enables the clamping mechanism body clamping the cap to rotate and reciprocate along the axis of the cap, so that the cap is screwed into or out of the tube body of the test tube.

[0008] Preferably, the first guiding assembly includes a guiding shaft assembly, and the guiding shaft assembly includes a spline shaft with one end connected to the clamping mechanism body and an outer cylinder sleeved outside the spline shaft; the driving assembly is connected to the outer cylinder to drive the outer cylinder to rotate and drive the spline shaft inside the outer cylinder to rotate.

[0009] Preferably, the second guiding assembly includes a lead screw nut assembly, and the lead screw nut assembly includes a lead screw and a nut sleeved outside the lead screw. The lead screw is connected to the spline shaft; the spline shaft drives the lead screw to rotate, so that the lead screw reciprocates axially relative to the nut.

[0010] Preferably, the first guiding assembly is located between the second guiding assembly and the clamping mechanism body; the rotation axes of the spline shaft, the lead screw, and the clamping mechanism body coincide.

[0011] Preferably, the driving assembly includes a motor driving assembly, and the motor driving assembly includes a motor, a driving wheel, a driven wheel, and a synchronous belt. The driven wheel is sleeved outside the outer cylinder of the guiding shaft assembly; the motor drives the driving wheel to rotate, drives the driven wheel to rotate, and enables the outer cylinder to drive the spline shaft to rotate.

[0012] Preferably, the clamping mechanism body includes a plurality of cap claws for clamping the caps of test tubes, an elastic member connected to the cap claws, and a guiding member; wherein,

[0013] The elastic member drives the relative opening between the plurality of cap claws to completely or partially wrap the cap; the guiding member drives the relatively opened plurality of cap claws to approach each other to clamp the cap; the plurality of cap claws rotate together with the first guiding assembly and move along the axis direction of the cap to screw the cap.

[0014] Preferably, the number of the cap claws is two, and the two cap claws are rotationally connected through a rotating shaft; the elastic member includes a torsion spring, and the torsion spring is sleeved outside the rotating shaft rod and located between the two cap claws; the guiding member is a limiting sleeve, and the limiting sleeve is provided with a third through hole. The driving assembly enables the two cap claws to extend into or away from the third through hole, so that the two cap claws clamp or loosen the cap under the resilience of the elastic member.

[0015] Preferably, a first connecting block is further connected to one end of the cap claw. A convex block is provided on the first connecting block, and a second through hole is provided on the convex block; the first connecting block is prism-shaped, the included angle between the two side surfaces of the first connecting block is 90°, and the convex block is provided on a bottom surface of the first connecting block; the cap claw includes two finger claws, and the two finger claws are respectively connected to the two side surfaces of the first connecting block with an included angle of 90°.

[0016] Preferably, the inner wall of the third through hole presses one end of the two cap grippers, reducing the opening angle of the two cap grippers to clamp the cap of the test tube; the size of the third through hole allows the two cap grippers clamping the cap of the test tube to pass through.

[0017] Preferably, it further includes a fixing assembly, and the fixing assembly includes a fixing base and a connecting member. The outer cylinder and the nut are respectively connected to the fixing base through the connecting member, and the driving assembly is connected to the fixing base.

[0018] Preferably, the lead screw is connected to the spline shaft through a coupling; it further includes a position detection device for detecting the initial positions of the first guiding assembly and / or the second guiding assembly.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: An object of the present invention is to provide a test tube cap screwing device. Through a driving assembly, the rotation of the clamping mechanism body and the reciprocating movement along the axial direction of the test tube can be simultaneously realized to perform the cap screwing operation on the test tube cap. The structure is simple, easy to control, and occupies a small space. In a preferred embodiment, through the cooperation of the lead screw-nut assembly, the guiding shaft assembly, the torsion spring and the limiting block, driven by the motor, the guiding shaft assembly rotates to drive the lead screw of the lead screw-nut assembly to move along the axial direction of the cap, and finally realizes the rotational movement of the cap gripper and the movement along the axial direction of the cap, and finally realizes removing the cap or putting on the cap. The operation is simple and efficient, and the structure is simple and easy to implement.

[0020] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it according to the content of the description, the following are some embodiments for detailed description. The specific implementation manners of the present invention are given in detail by the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the illustrative embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0022] Figure 1 is a three-dimensional structural schematic diagram when the two cap grippers of the cap screwing device body in an embodiment of the present invention are opened;

[0023] Figure 2 is a three-dimensional structural schematic diagram when the two cap grippers of the cap screwing device body in an embodiment of the present invention clamp the test tube cap;

[0024] Figure 3 is a sectional view of the cap screwing device body in an embodiment of the present invention;

[0025] Figure 4Explosion structure schematic diagram of the clamping mechanism body of the present invention;

[0026] Figure 5 Stereo structure schematic diagram of two tube cap jaws and a test tube before clamping of the present invention;

[0027] Figure 6 Stereo structure schematic diagram of two tube cap jaws and a test tube when clamped of the present invention;

[0028] Figure 7 Connection structure schematic diagram of a finger claw and a first connection block in an embodiment of the present invention;

[0029] Figure 8 Stereo structure schematic diagram of the first connection block in an embodiment of the present invention;

[0030] Figure 9 Stereo structure schematic diagram of the finger claw in an embodiment of the present invention.

[0031] In the figure:

[0032] 400, test tube; 410, tube cap;

[0033] 500, cap screwing device body;

[0034] 510, clamping mechanism body; 511, tube cap jaw; 5111, finger claw; 5111a, guiding inclined surface; 5111b, first protrusion; 5111c, second protrusion; 512, rotating shaft rod; 513, first connection block; 5131, convex block; 5131a, second through hole; 514, torsion spring; 515, second connection block; 516, limiting sleeve; 5161, third through hole; 517, limiting block;

[0035] 520, guiding shaft assembly; 521, spline shaft; 522, outer cylinder;

[0036] 530, lead screw nut assembly; 531, lead screw; 532, nut;

[0037] 540, driving assembly; 541, motor; 542, driving wheel; 543, driven wheel; 544, synchronous belt;

[0038] 550, fixing assembly; 551, fixing base; 552, connecting piece; 5521, first connecting piece; 5522, second connecting piece; 5523, third connecting piece; 5524, fourth connecting piece;

[0039] 560, coupling;

[0040] 570, position detection device; 571, optocoupler. Detailed implementation manners

[0041] The present invention will be further described in detail below with reference to the accompanying drawings. The foregoing and other objects, features, aspects, and advantages of the present invention will become more apparent, so that those skilled in the art can implement it according to the description in the specification. In the drawings, for clarity, the shapes and dimensions may be enlarged, and the same reference numerals will be used in all the figures to indicate the same or similar components. In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, etc. are based on the orientation or positional relationship shown in the drawings. In particular, "height" corresponds to the dimension from the top to the bottom, "width" corresponds to the dimension from the left to the right, and "depth" corresponds to the dimension from the front to the back. These relative terms are for convenience of description and generally do not intend to require a specific orientation. Terms related to attachment, connection, etc. (e.g., "connect" and "attach") refer to the relationship in which these structures are directly or indirectly fixed or attached to each other through an intermediate structure, as well as a movable or rigid attachment or relationship, unless otherwise explicitly stated.

[0042] Next, with reference to the accompanying drawings and specific embodiments, the present invention will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined with each other to form new embodiments.

[0043] Embodiment 1

[0044] As Figures 1 to 9 shown, the present invention provides a test tube cap screwing device, including a cap screwing device body 500. The cap screwing device body 500 includes a plurality of clamping mechanism bodies 510 for clamping the caps 410 of the test tubes 400, a driving component, a first guiding component, and a second guiding component. The first guiding component is connected to the second guiding component, and the clamping mechanism body 510 is connected to the first guiding component; wherein,

[0045] The driving component drives the first guiding component to rotate, drives the second guiding component to rotate and reciprocate along the axial direction of the cap 410, so as to drive the rotating first guiding component to reciprocate along the axial direction of the cap 410, so that the clamping mechanism body 510 clamping the cap 410 rotates and reciprocates along the axial direction of the cap 410, and the cap 410 is screwed into or out of the body of the test tube 400.

[0046] In this embodiment, specifically, the first guiding component includes a guiding shaft component 520. The guiding shaft component 520 includes a spline shaft 521 with one end connected to the clamping mechanism body 510, and an outer cylinder 522 sleeved outside the spline shaft 521. The outer cylinder 522 is provided with internal splines matching the external splines of the spline shaft 521. The spline shaft 521 can axially reciprocate within the outer cylinder 522 or rotate together with the outer cylinder 522. The driving component is connected to the outer cylinder 522 to drive the outer cylinder 522 to rotate, driving the spline shaft 521 within the outer cylinder 522 to rotate.

[0047] In one embodiment, the guiding shaft component 520 further includes a plurality of balls (not shown in the figure) movably arranged between the spline shaft 521 and the outer cylinder 522. The outer wall of the spline shaft 521 is provided with three raceways that are 120° apart from each other, and the balls roll in the raceways. In one embodiment of the driving component, the driving component includes a motor driving component 540. The motor driving component 540 includes a motor 541, a driving wheel 542, a driven wheel 543, and a synchronous belt 544. The driven wheel 543 is sleeved outside the outer cylinder 522 of the guiding shaft component 520. The motor 541 drives the driving wheel 542 to rotate, and drives the driven wheel 543 to rotate under the synchronous action of the synchronous belt 544, causing the outer cylinder 522 connected to the inner circumferential side of the driven wheel 543 to rotate, and the outer cylinder 522 drives the spline shaft 521 sleeved inside the outer cylinder 522 to rotate.

[0048] It should be understood that any existing driving component that can drive a component to rotate can be used as the driving component of the present invention.

[0049] The second guiding component includes a lead screw nut component 530. The lead screw nut component 530 includes a lead screw 531 and a nut 532 sleeved outside the lead screw 531. The lead screw 531 is connected to the spline shaft 521 through a coupling 560. The spline shaft 521 drives the lead screw 531 to rotate, causing the lead screw 531 to axially reciprocate relative to the nut 532 along the axis of the lead screw 531.

[0050] It further includes a fixing component 550, which includes a fixing base 551 and a connecting piece 552. The outer cylinder 522 and the nut 532 are respectively connected to the fixing base 551 through the connecting piece 552, and the driving component is connected to the fixing base 551. The connecting piece 552 includes a first connecting piece 5521, a second connecting piece 5522, and a third connecting piece 5523. The nut 532 is fixedly connected to the fixing base 551 through the first connecting piece 5521, the outer cylinder 522 is fixedly connected to the fixing base 551 through the second connecting piece 5522, and the motor 541 and the driving wheel 542 are fixedly connected to the fixing base 551 through the third connecting piece 5523 respectively. The outer cylinder 522 is rotatably arranged in a through hole (not shown in the figure) of the second connecting piece 5522, and the outer wall of the outer cylinder 522 is rotatably connected to the inner wall of the through hole of the second connecting piece 5522 through a bearing (not shown in the figure). It further includes a fourth connecting piece 5524, which is fixedly connected to the fixing base 551. The second connecting piece 5522 passes through a through hole (not shown in the figure) of the fourth connecting piece 5524 and is fixed to the fourth connecting piece 5524, and thus is fixed to the fixing base 551.

[0051] The clamping mechanism body 510 includes a plurality of cap claws 511 for clamping the caps 410 of the test tubes 400, an elastic member connected to the cap claws 511, and a guiding member; wherein,

[0052] The elastic member drives the relative opening between the plurality of cap claws 511 to completely or partially wrap the cap 410; the guiding member drives the relatively opened plurality of cap claws 511 to approach each other to clamp the cap 410. Under the drive of the guiding shaft assembly, the plurality of cap claws 511 rotate and move along the axis direction of the cap 410 at the same time to screw the cap 410.

[0053] The number of the cap claws 511 is two. The elastic member includes a torsion spring 514, and the torsion spring 514 abuts against the two cap claws 511 respectively. The elastic force of the torsion spring 514 itself causes the two cap claws 511 to open at a certain angle to form a first cavity for clamping the cap 410.

[0054] In one embodiment, one end of the cap gripper 511 is provided with a first through hole. The two cap grippers 511 are rotatably connected by a rotating shaft rod 512 passing through the first through hole. The torsion spring 514 is sleeved outside the rotating shaft rod 512 and is located between the two cap grippers 511. One end of the rotating shaft rod 512 is fixed by a retaining ring (not shown in the figure). The elastic force of the torsion spring 514 itself causes the two cap grippers 511 to open, and the cap 410 is wrapped in the first cavity. Driven by the guide member, the two cap grippers 511 approach each other until the two cap grippers 511 clamp the cap 410. At this time, the inner surface of the cap gripper 511 is in partial or full contact with the outer surface of the cap 410, so that the contact surface between the cap gripper 511 and the cap 410 is larger, improving the clamping force.

[0055] In one embodiment, it further includes a first connecting block 513 connected to one end of the cap gripper 511. The first connecting block 513 is in the shape of a triangular prism. One bottom surface of the first connecting block 513 is provided with a convex block 5131, and a second through hole 5131a is provided on the convex block 5131. The two cap grippers 511 are rotatably connected by a rotating shaft rod 512 passing through the second through hole 5131a. The torsion spring 514 is sleeved outside the rotating shaft rod 512 and is located between the two cap grippers 511. One end of the rotating shaft rod 512 is fixed by a retaining ring (not shown in the figure). The cap gripper 511 includes two finger claws 5111, and the two finger claws 5111 are respectively connected to two side surfaces of the first connecting block 513. The first connecting block 513 forms an angle of 90° with the two side surfaces of the two finger claws 5111 respectively, so that the four finger claws 5111 of the two cap grippers 511 are evenly distributed on the periphery of the cap 410, making the force on the cap 410 uniform. The finger claw 5111 is in the shape of a cuboid, and one end surface of the finger claw 5111 is flush with the bottom surface of the first connecting block 513 where the convex block 5131 is provided. In one embodiment, when the two cap grippers 511 clamp the cap 410, the two first connecting blocks 513 do not contact each other, so as not to affect the screwing of the cap 410 after the two cap grippers 511 clamp the cap 410.

[0056] The size of the first connecting block 513 should not be too large, so that the two cap grippers 511 can clamp the cap 410 under the limiting action of the limiting sleeve 516, and the distance that the two cap grippers 511 need to move along the axis direction of the cap 410 from the time when the two cap grippers 511 are relatively opened to just completely wrap the cap 410 to the time when the two cap grippers 511 approach each other to clamp the cap 410 is not too large, reducing the space required for movement. The size of the first connecting block 513 also affects the relative opening amplitude of the two cap grippers 511 and the spacing between the arrangements of a number of test tubes 400.

[0057] It further includes a second connecting block 515. The second connecting block 515 is of a hollow structure. The first connecting block 513 is located within the second connecting block 515. Both ends of the rotating shaft rod 512 penetrate and are connected to one end of the second connecting block 515. The other end of the second connecting block 515 is connected to the guide shaft assembly 520.

[0058] The guiding member is a limiting sleeve 516. The limiting sleeve 516 is provided with a third through hole 5161. The size of the second connecting block 515 is smaller than that of the third through hole 5161, so that the second connecting block 515 can move within the third through hole 5161. The guide shaft assembly 520 drives the second connecting block 515 to move along the axial direction of the pipe cap 410, driving the first connecting block 513 connected to the second connecting block 515 and the two pipe cap clamping claws 511 to move along the axial direction of the pipe cap 410, extending into or away from the third through hole 5161. When the two pipe cap clamping claws 511 gradually extend into the third through hole 5161, the two pipe cap clamping claws 511 approach each other until they clamp the pipe cap 410; when the two pipe cap clamping claws 511 disengage from the third through hole 5161, the two pipe caps 410 release the clamped pipe cap 410 under the elastic rebound of the elastic member, that is, the two pipe caps 410 clamp or release the pipe cap 410 under the elastic force of the elastic member. The limiting sleeve 516 is fixedly installed on the surface of an object, so that the limiting sleeve 516 will not move along with the movement of the two pipe cap clamping claws 511 driven by the guide shaft assembly 520.

[0059] One end of the second connecting block 515 is connected to the guide shaft assembly 520 through a limiting block 517. The limiting block 517 is of a hollow structure. One end is connected within the second connecting block 515, and the size of the opposite end is larger than that of the third through hole 5161. The limiting block 517 is located on the other side of the limiting sleeve 516 relative to the pipe cap clamping claws 511 to limit the maximum distance that the pipe cap clamping claws 511 can move away from the limiting sleeve 516 under the drive of the guide shaft assembly 520.

[0060] On the outer wall of the finger claw 5111 near one end of the limit sleeve 516, there is a guiding inclined surface 5111a; the guiding inclined surfaces 5111a of the four finger claws 5111 make one end surface of the two cap clamping claws 511 facing the limit sleeve 516 have a structure that gradually decreases from large to small. When the limit block 517 abuts against the limit sleeve 516, all or part of the guiding inclined surface 5111a extends into the third through hole 5161. Further, when the limit block 517 abuts against the limit sleeve 516, the guiding inclined surface 5111a just completely extends into the third through hole 5161. The inclination angle of the guiding inclined surface 5111a is such that when the guiding inclined surface 5111a just completely extends into the third through hole 5161, the first cavity formed by the relative opening of the two cap clamping claws 511 under the restoring force of the elastic member and the limiting action of the limit sleeve 516 can just completely wrap the cap 410 inside. When the cap clamping claws 511 continue to extend into the third through hole 5161 under the driving action of the guiding shaft assembly 520, the opening angle of the two cap clamping claws 511 gradually becomes smaller until the cap 410 is clamped. At this time, the two cap clamping claws 511 can completely pass through the third through hole 5161 and the outer contour when inside the third through hole 5161 fits the inner wall of the third through hole 5161.

[0061] The outer contour of the cap 410 of the test tube commonly used in the market is cylindrical, the third through hole 5161 is cylindrical, the side surfaces of the first connecting block 513 connected to the two finger claws 5111 are of the same size, and the outer contour when the two cap clamping claws 511 clamp the cap 410 can be circumscribed by a cylinder, and the shape and size of this cylinder are the same as those of the third through hole 5161, and the inner surfaces of the two cap clamping claws 511 are evenly attached to the outer wall of the cap 410. In the extremely rare case where the outer contour of the cap 410 is irregular, the inner contour of the two cap clamping claws 511 matches the outer contour of the cap 410, and the outer contour of the two cap clamping claws 511 can still be circumscribed by a cylinder, and the shape and size of this cylinder are the same as those of the third through hole 5161, so that while the two cap clamping claws 511 can be pressed by the limit sleeve 561 for clamping, the two cap clamping claws 511 can rotate in the third through hole 5161.

[0062] The finger claw 5111 is provided with a first protrusion 5111b and a second protrusion 5111c. The first cavity is the space formed between the inner surfaces of the two cap claws 511, the first protrusion 5111b and the second protrusion 5111c. The distance between the first protrusion 5111b and the second protrusion 5111c is slightly greater than the height of the cap 410. When the two cap claws 511 clamp the cap 410 under the pressing action of the limit sleeve 516, the cap 410 is located in the first cavity formed between the inner surfaces of the two cap claws 511, the first protrusion 5111b and the second protrusion 5111c, and the cap 410 fits against the inner surfaces of the two cap claws 511. The third through hole 5161 makes the size of the first cavity formed by the two cap claws 511 close to each other for clamping slightly smaller than the outer contour size of the cap 410. The stiffness of the cap claws 511 and the limit sleeve 516 is much greater than the stiffness of the cap 410, that is, the elastic deformation performance of the cap 410 is better than that of the cap claws 511 and the limit sleeve 516. Under the pressing and limiting action of the inner wall of the third through hole 5161 of the limit sleeve 516, the two cap claws 511 clamp the cap 410, and under the elastic deformation of the cap 410 itself, the two cap claws 511 continue to approach each other until the cap 410 is clamped for screwing the cap. When screwing the cap, the cap 410 will not slide relative to the cap claws 511. Among them,

[0063] When the limit block 517 abuts against the limit sleeve 516, the two cap claws 511 open so that an outer wall of the cap 410 abuts against the first protrusion 5111b. The guide shaft assembly 510 drives the two cap claws 511 to extend into the third through hole 5161. When the two cap claws 511 approach each other and clamp the cap 410, the cap claws 511 abut against the second protrusion 5111c relative to the other outer wall of the limit sleeve 516, and the guide shaft assembly 510 drives the two cap claws 511 to rotate for screwing the cap.

[0064] The rotation axes of the first cavity, the lead screw 531 and the spline shaft 521 coincide.

[0065] In one embodiment, the cap claws 511 and the limit sleeve 516 are made of a metal material with surface oxidation to improve the surface wear resistance; the cap 410 is made of plastic.

[0066] In one embodiment, the inner surface of the cap claws 511 for clamping the cap 410 is provided with a rubber layer (not shown in the figure) to increase the clamping force on the cap 410.

[0067] It further includes a position detection device 570 for detecting the initial positions of the first guiding component and / or the second guiding component. In this embodiment, specifically, the position detection device 570 includes an optocoupler 571. The optocoupler 571 is located in the axial direction of the lead screw 531. When one end of the lead screw 531 moves axially along the tube cap 410 and exactly blocks the light of the optocoupler 571, it is the initial position, and it cooperates with the optocoupler 571 to detect the initial position of the second guiding component.

[0068] By the forward and reverse rotation of the motor 541, the lead screw 531 and the spline shaft 521 are driven to rotate forward and reverse, so that the clamping mechanism body 510 rotates forward and reverse while reciprocating axially along the test tube 400. When removing the cap, the motor 541 drives the spline shaft 521 and the lead screw 531 to rotate. The lead screw 531 moves axially along the test tube 400 in the nut 532 towards the direction where the test tube 400 is located. The two tube cap claws 511 open at a certain angle and move until the first cavity between the two tube cap claws 511 surrounds the tube cap 410. The motor 541 drives the spline shaft 521 and the lead screw 531 to rotate, so that the lead screw 531 moves axially along the test tube 400 away from the test tube 400. Under the limiting action of the limiting sleeve 516, the opening angle of the two tube cap claws 510 becomes smaller until the tube cap 410 is clamped, driving the tube cap 410 to perform a spiral motion away from the body of the test tube 400 until the tube cap 410 is separated from the body of the test tube 400, realizing cap removal.

[0069] When capping, the motor 541 drives the spline shaft 521 and the lead screw 531 to rotate. The lead screw 531 moves axially along the test tube 400 in the nut 532 towards the direction where the test tube 400 is located until the tube cap 410 is screwed into the body of the test tube 400. The limiting sleeve 516 removes the limiting action, and the opening angle of the two tube cap claws 511 becomes larger and separates from the tube cap 410, realizing capping.

[0070] Before screwing the cap, according to the distance that the spline shaft 521 needs to move axially along the test tube 400 when the opening angle of the two tube cap claws 510 changes to exactly completely wrap the tube cap 410 under the action of the limiting sleeve 516, the distance between the limiting block 517 and the tube cap claw 511 is set for screwing the cap. It should be understood that the length of the tube cap claw 510 can be designed according to requirements to be able to satisfy that the two tube cap claws 510 completely surround and clamp the tube cap 410.

[0071] A test tube cap screwing device provided by the present invention drives a first guiding component to rotate through a driving component, drives a second guiding component to rotate and reciprocate along the axial direction of a test tube 400, so as to drive the rotating first guiding component to reciprocate along the axial direction of the test tube 400, and enables a clamping mechanism body for clamping a tube cap 410 to rotate and reciprocate along the axial direction of the test tube 400 for screwing the cap. Only one driving component can enable the tube cap clamping jaws 511 to rotate and reciprocate along the axial direction of the test tube 400 simultaneously, with a simple structure and easy control.

[0072] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the embodiments shown here.

Claims

1. A test tube cap screwing device, comprising a cap screwing device body (500), characterized in that, The cap screwing device body (500) includes a plurality of clamping mechanism bodies (510) for clamping the tube caps (410) of the test tube (400), a driving assembly, a first guiding assembly, and a second guiding assembly. The first guiding assembly is connected to the second guiding assembly, and the clamping mechanism body (510) is connected to the first guiding assembly. Among them, the driving assembly drives the first guiding assembly to rotate, drives the second guiding assembly to rotate and reciprocate along the axial direction of the tube cap (410), so as to drive the rotating first guiding assembly to reciprocate along the axial direction of the tube cap (410), and enables the clamping mechanism body (510) clamping the tube cap (410) to rotate and reciprocate along the axial direction of the tube cap (410), so as to screw the tube cap (410) into or out of the tube body of the test tube (400); the clamping mechanism body (510) includes two tube cap claws (511) for clamping the tube caps (410) of the test tube (400), an elastic member connected to the tube cap claws (511), and a guiding member. Among them, the elastic member drives the two tube cap claws (511) to open relatively to completely or partially wrap the tube cap (410); the guiding member drives the two relatively opened tube cap claws (511) to approach each other to clamp the tube cap (410); the two tube cap claws (511) rotate together with the first guiding assembly and move along the axial direction of the tube cap (410) to screw the tube cap (410). The two tube cap claws (511) are rotatably connected through a rotating shaft rod (512); the elastic member includes a torsion spring (514), and the torsion spring (514) is sleeved outside the rotating shaft rod (512) and is located between the two tube cap claws (511); the guiding member is a limiting sleeve (516), and the limiting sleeve (516) is provided with a third through hole (5161). The driving assembly enables the two tube cap claws (511) to extend into or away from the third through hole (5161), so as to clamp the two tube caps (410) or loosen the tube cap (410) under the resilience of the elastic member; It further includes a first connecting block (513) connected to one end of the tube cap claw (511). The first connecting block (513) is provided with a convex block (5131), and the convex block (5131) is provided with a second through hole (5131a); the first connecting block (513) is in the shape of a triangular prism, the included angle between the two side faces of the first connecting block (513) is 90°, and the convex block (5131) is arranged on a bottom surface of the first connecting block (513); the tube cap claw (511) includes two finger claws (5111), and the two finger claws (5111) are respectively connected to the two side faces of the first connecting block (513) with an included angle of 90°.

2. The test tube cap screwing device according to claim 1, wherein, The first guiding component includes a guiding shaft component (520), and the guiding shaft component (520) includes a spline shaft (521) with one end connected to the clamping mechanism body (510), and an outer cylinder (522) sleeved outside the spline shaft (521); the driving component is connected to the outer cylinder (522) to drive the outer cylinder (522) to rotate, and drive the spline shaft (521) inside the outer cylinder (522) to rotate.

3. The test tube cap screwing device according to claim 2, characterized in that, The second guiding component includes a lead screw nut component (530), and the lead screw nut component (530) includes a lead screw (531) and a nut (532) sleeved outside the lead screw (531), and the lead screw (531) is connected to the spline shaft (521); the spline shaft (521) drives the lead screw (531) to rotate, so that the lead screw (531) reciprocates axially relative to the nut (532) along the lead screw (531).

4. The test tube cap screwing device according to claim 3, wherein, The first guiding component is located between the second guiding component and the clamping mechanism body (510); the rotation axes of the spline shaft (521), the lead screw (531), and the clamping mechanism body (510) coincide.

5. The test tube cap screwing device according to claim 2, wherein, The driving component includes a motor driving component (540), and the motor driving component (540) includes a motor (541), a driving wheel (542), a driven wheel (543), and a synchronous belt (544), and the driven wheel (543) is sleeved outside the outer cylinder (522) of the guiding shaft component (520); the motor (541) drives the driving wheel (542) to rotate, drives the driven wheel (543) to rotate, and enables the outer cylinder (522) to drive the spline shaft (521) to rotate.

6. The test tube cap screwing device according to claim 1, wherein, The inner wall of the third through hole (5161) presses one end of the two cap claws (511), so that the opening angle of the two cap claws (511) becomes smaller to clamp the cap of the test tube (400); the size of the third through hole (5161) allows the two cap claws (511) clamping the cap of the test tube (400) to pass through.

7. The test tube cap screwing device according to claim 3, characterized in that, It further includes a fixing component (550), and the fixing component (550) includes a fixing base (551) and a connecting piece (552), the outer cylinder (522) and the nut (532) are respectively connected to the fixing base (551) through the connecting piece (552), and the driving component is connected to the fixing base (551); the lead screw (531) and the spline shaft (521) are connected through a coupling (560); it further includes a position detection device (570) for detecting the initial positions of the first guiding component and / or the second guiding component.

Images